Several new alkaloids of the pleiocarpine type, namely N-1-methoxycarbonyl-12-hydroxy-Delta 16,17-kopsinine, N-1-methoxycarbonyl-11,12-methylenedioxy-Delta(16,17)-kopsinine N (4) oxide and N-1-methoxycarbonyl-12-methoxy-Delta(16,17)-kopsinine N (4) oxide, in addition to N-1-methoxycarbonyl-11,12-methylenedioxy-Delta(16,17)-kopsinine, N-1-methoxycarbonyl-12-methoxy-Delta(16,17)-kopsinine and kopsinine have been isolated from the leaves and stem of Kopsia profunda.